Several years ago I bought this 9mm barrel conversion for Glock M20 or M40. Got older changed my mind and bought a Glock M43. I put it up for sale on Ebay if anyone is interested. It's new never fired and I don't think they make them anymore. Link below.
https://www.ebay.com/itm/275185783028?_trksid=p2471758.m4704